问题
单项选择题
An investor opens a margin account with an initial deposit of $5000. He then purchases 300 shares of a stock at $30. His margin account has a maintenance margin requirement of 30 percent. Ignoring commissions and interest, the price at which the investor receives a margin call is closest to.（）
A. $14.26.
B. $18.72.
C. $19.05.
答案
参考答案：C
解析：
[分析]：
即当股票的市场价格下跌至19.05美元时，该从事保证金交易的投资者将会收到补足保证金的通知。 [考点] 保证金交易